Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 840e460b873ee54343bce0a88cb2458422f359c4
  - Move to version 1.6.1
    
    Move SDC to version 1.6.1
    Issue-ID: SDC-2755
    
    Change-Id: Ie9fcbacad5f0403bb98250928aff78b2354877bf
    Signed-off-by: shrek2000 <oren.kleks@amdocs.com>
    
diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index ce098ef..840e460 160000
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit ce098ef13dd6786e7e2a2a04466e72efa3ba9242
+Subproject commit 840e460b873ee54343bce0a88cb2458422f359c4